Vehicle Glass Run Structure for High-Frequency Wind Noise Reduction
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Solution Overview
Problem
Existing solutions for reducing wind noise in vehicles, such as thicker door glasses and acoustic glasses, increase weight and cost, and there is a lack of effective countermeasures for noise reduction in the high frequency range using glass runs.
Innovation Solution
A glass run with a protruding door glass lip or bulge that is harder than the bottom wall, increasing the rigidity and allowing efficient vibration energy transfer and dissipation, thereby reducing wind noise through impedance matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If thicker door glass or acoustic glass is used to reduce wind noise, then noise reduction effect is improved, but weight and cost increase
Solution Approach 1:
The patent introduces a glass run as an intermediary component between the door glass and door frame. This glass run includes a sealing member with specific structural features (protrusions, recesses, multiple sealing lips) that enable it to act as a mediator in the sound transmission path, reducing wind noise without requiring thicker or more expensive acoustic glass
Solution Approach 2:
The patent changes the parameters of the glass run structure, specifically creating a sealing member with multiple sealing lips at different positions and configurations. This structural parameter change allows the glass run to effectively reduce high-frequency wind noise (1 kHz or higher) while maintaining the original door glass specifications
2Object-affected harmful factors
If conventional glass run structures are used, then basic sealing function is provided, but noise reduction effect in high frequency range is insufficient
Solution Approach 1:
The sealing member is segmented into multiple functional components including first and second sealing lips, protrusions, and recesses positioned at different locations. This segmentation allows each component to address specific aspects of sound transmission at different frequencies, particularly improving high-frequency noise reduction above 1 kHz
Solution Approach 2:
The glass run design implements local quality by creating specific structural features (protrusions, recesses, varying lip configurations) at specific locations along the sealing member. These localized structural variations optimize the sealing performance and noise reduction effect at different positions where sound transmission characteristics differ
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed glass run design effectively reduces wind noise in the 2 kHz to 5 kHz range without increasing weight or cost, maintaining sealing performance and improving passenger comfort.
Implementation Method 1
the bottom wall has a door glass lip which protrudes from a door glass surface of the bottom wall, and the door glass lip is harder than the bottom wall... the rigidity of the glass run, which includes the bottom wall, is increased, allowing the vibration energy of the door glass to flow and dissipate efficiently when the glass run is in contact with the door glass
Data Source
AI summary
A glass run has a basic framework with a bottom wall, a vehicle outer side wall, and a vehicle inner side wall, the basic framework being attached to a door frame, and the glass run guides an up and down movement of a door glass, wherein the bottom wall has a door glass lip which protrudes from a door glass surface of the bottom wall and a door glass bulge which is interposed between the bottom wall and the door glass lip, and at least one of the door glass lip and the door glass bulge is harder than the bottom wall.